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In practical terms the tricky part is knowing your apparent wind angle without a vane and gauge that give you the angle. Speed is simple now with GPS, and true wind is easy to find old-school if you just shoot into the wind briefly while watching your compass.

If you're trig-challenged like me, but know true wind and speed, and boatspeed, then you can do a qick pencil plot an a chart and just measure the long AW line.
 
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